Patch taken from the debian unstable package
original posted by Fabian Franz on the freenx mailinglist


Index: nxproxy/Main.c
--- nxproxy/Main.c.old	2007-07-18 17:39:13.000000000 +0200
+++ nxproxy/Main.c	2008-03-12 04:40:30.000000000 +0100
@@ -36,28 +36,48 @@
   int result = -1;
 
   char *options = NULL;
-
+  
+  char *nx_commfd_str = NULL;
+  
   options = getenv("NX_DISPLAY");
-
-  if (NXTransParseCommandLine(argc, argv) < 0)
+  
+  if ((nx_commfd_str = getenv("NX_COMMFD")) != NULL)
   {
-    NXTransCleanup();
-  }
+  	int nx_commfd = atoi(nx_commfd_str);
 
-  if (NXTransParseEnvironment(options, 0) < 0)
-  {
-    NXTransCleanup();
+	if (result)
+		result = NXTransCreate(nx_commfd, NX_MODE_SERVER, options);
+ 
+	// go into endless loop
+
+	if (result)
+	{
+		while (NXTransRunning(NX_FD_ANY))
+			result = NXTransContinue(NULL);
+	}
   }
+  else
+  {
+    if (NXTransParseCommandLine(argc, argv) < 0)
+    {
+      NXTransCleanup();
+    }
+
+    if (NXTransParseEnvironment(options, 0) < 0)
+    {
+      NXTransCleanup();
+    }
+
+   /*
+    * This should not return...
+    */
+
+    #ifdef TEST
+    fprintf(stderr, "Main: Yielding control to NX entry point.\n");
+    #endif
 
-  /*
-   * This should not return...
-   */
-
-  #ifdef TEST
-  fprintf(stderr, "Main: Yielding control to NX entry point.\n");
-  #endif
-
-  result = NXTransProxy(NX_FD_ANY, NX_MODE_ANY, NX_DISPLAY_ANY);
+    result = NXTransProxy(NX_FD_ANY, NX_MODE_ANY, NX_DISPLAY_ANY);
+  }
 
   /*
    * ...So these should not be called.